摘要
基于FLAC 3D软件,尝试采用修正的cable单元建立全长粘结锚杆锚固顺倾层状岩体边坡数值分析模型,改进剪应力提取方法,分别模拟分析了锚杆杆体-砂浆界面上和砂浆-岩体界面上的剪应力分布及其影响因素。研究发现:砂浆-岩体界面上的剪应力比杆体-砂浆界面上小得多,且均以中性点为界方向相反,分布很不均匀,中性点附近大,锚杆两端小;不仅地震波幅值和频率对边坡锚固界面剪应力分布有很大影响,而且随地震波持时的增加锚固界面剪应力增大;锚杆长度也对锚固界面剪应力分布有很大影响,锚杆安设角度的影响则较小。获得了地震作用下锚固界面上剪应力分布,并揭示了地震动参数和锚固方式对剪应力分布的影响,为边坡锚固设计施工提供了重要参考。
Based on the FLAC 3D software,try to establish overall length grouted bolt anchorage bedding rock slope numerical analysis model by amendatory cable unit,and to improve shear stress extraction method.Shearing and evolution of bolt-mortar and mortar-rock interface are simulated and analyzed,respectively.The study found that the mortar-rock interface shear stress is far less than the bolt-mortar interface,and the distribution of shear stress is very uneven on both sides of the anchor neutral point.The shear stress near neutral point is large and the shear stress on bolt ends is small.Not only the amplitude and frequency of seismic wave has a great influence on the shear stress distribution of slope anchorage interface,but also the shear stress of slope anchorage interface increases with the increasement of seismic wave duration.The length of bolt also has a great influence on the shear stress distribution of slope anchorage interface,but the influence of anchor angle is smaller.For the first time,the shear stress distribution at the anchorage interface under earthquake is obtained,and the influence of ground motion parameters and anchorage modes on the distribution of shear stress is revealed.The study provides an reference for the design and construction of side slope anchorage.
作者
言志信
龙哲
张森
周小亮
董建华
江平
YAN Zhi-xin;LONG Zhe;ZHANG Sen;ZHOU Xiao-liang;DONG Jian-hua;JIANG Ping(School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;School of Civil and Traffic Engineering,Henan University of Urban Construction,Pingdingshan 467036,China;Yunnan Research Institute of Highway Science and Technology,Kunming 650051,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2019年第6期1029-1040,共12页
Journal of Vibration Engineering
基金
国家自然科学基金面上项目(41372307,51478065)
甘肃省建设科技攻关项目(kjxm2014-42,JK2013-20)
关键词
岩体边坡
锚固
界面剪力
锚固界面
影响因素
rock slope
anchoring
interface shear stress
anchorage interface
influencing factor
